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Published on: October 12, 2022
Filamentation Involves Two Overlapping, but Distinct, Programs of Filamentation in the Pathogenic Fungus Candida
Jahaun Azadmanesh1,2, Austin M Gowen1, Paul E Creger1
1Biology Department, University of Nebraska Omaha, Nebraska 68182.
Abstract:
The ability of the human pathogenic fungus Candida albicans to switch between yeast-like and filamentous forms of growth has long been linked to pathogenesis. Numerous environmental conditions, including growth at high temperatures, nutrient limitation, and exposure to serum, can trigger this morphological switch and are frequently used in in vitro models to identify genes with roles in filamentation. Previous work has suggested that differences exist between the various in vitro models both in the genetic requirements for filamentation and transcriptional responses to distinct filamentation-inducing media, but these differences had not been analyzed in detail. We compared 10 in vitro models for filamentation and found broad genetic and transcriptomic differences between model systems. The comparative analysis enabled the discovery of novel media-independent genetic requirements for filamentation as well as a core filamentation transcriptional profile. Our data also suggest that the physical environment drives distinct programs of filamentation in C. albicans, which has significant implications for filamentation in vivo.
Insights
The study reveals that different laboratory conditions significantly alter how the fungus Candida albicans switches to its filamentous form, impacting gene requirements and transcriptional responses. This highlights the importance of the physical environment in fungal pathogenesis.
Area of Science:
- Microbiology
- Mycology
- Medical Mycology
Background:
- The human pathogenic fungus *Candida albicans* exhibits morphological plasticity, switching between yeast and filamentous growth forms.
- This morphological switch is closely associated with fungal pathogenesis and can be induced by various environmental cues in laboratory settings.
- Previous research indicated variability in genetic and transcriptional responses across different *in vitro* filamentation models, but detailed comparative analyses were lacking.
Purpose of the Study:
- To comprehensively compare multiple *in vitro* models of *Candida albicans* filamentation.
- To identify differences in genetic requirements and transcriptional profiles across these models.
- To uncover novel genes and pathways involved in filamentation, independent of specific media conditions.
Main Methods:
- Comparative analysis of 10 distinct *in vitro* models for inducing *Candida albicans* filamentation.
- Genetic screening to identify genes essential for filamentation across different conditions.
- Transcriptomic analysis to assess gene expression patterns in response to various filamentation-inducing media.
Main Results:
- Significant genetic and transcriptomic variations were observed among the 10 *in vitro* models.
- Identification of novel genes required for filamentation that are independent of specific media formulations.
- Elucidation of a core transcriptional profile associated with *Candida albicans* filamentation.
- Evidence suggesting that the physical environment dictates distinct filamentation programs.
Conclusions:
- The choice of *in vitro* model system profoundly influences the study of *Candida albicans* filamentation.
- Comparative analysis reveals conserved and novel genetic factors and transcriptional responses governing filamentation.
- Understanding environment-specific filamentation pathways is crucial for deciphering *in vivo* pathogenesis and developing targeted therapies.
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